For each game you win, you will get a prize of 300 coins that you can use to purchase different PowerUp packages in the game store.
To access the Shop, you must press the shop icon in the lower left corner of your screen. By doing so, you will be able to view your current balance of coins and PowerUps at the top end.
By scrolling down, you will find the "PowerUps" section where you will see the different package offers that you can purchase from: great move, X-rays, word detector and magic move.
For more information on these items, we invite you to visit the articles: PowerUps and How can I use PowerUps in the game?